/*  
 *  Copyright 2006 Paul Jack.
 *
 *  This file is part of the Dex compiler suite. 
 *  
 *  Dex is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *  
 *  Dex is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 *  Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
package dex.compiler.interpreter.value;


import java.util.Collection;

import dex.compiler.checker.type.Type;
import dex.misc.Conversion;
import dex.misc.Converter;


/**
 * A value of a Dex data type.
 */
public abstract class Value {


	/**
	 * Returns a string representation of this value.
	 */
	public abstract String toString();


	/**
	 * Returns the type of this value.
	 * 
	 * @return  the type of this value
	 */
	public abstract Type type();


	/**
	 * Convenience for converting a collection of values to a collection
	 * of types.  Handy for matching actual arguments to formal declarations.
	 * 
	 * @param values  the values to convert
	 * @return  an unmodifiable collection of those values' types
	 */
	public static Collection<Type> types(Collection<Value> values) {
		return new Conversion<Value,Type>(values, new Converter<Value,Type>() {
			public Type convert(Value value) {
				return value.type();
			}
		});
	}
}
